Measures. The study involved many measures.
Only those referred to in this article are described
here. Psychological states were assessed bi-monthly
as follows: depressive symptomatology was assessed
with the 20-item Centers for Epidemiological Studies-
Depression measure (CES-D) (Radloff, 1977).
Participants responded on 4-point Likert scales how
often they felt that way during the past week (e.g.
"I was bothered by things that usually don't bother
me," "I felt that I could not shake off the blues
even with help from my family or friends,